Image uploading

[eluser]Shahgeb[/eluser]
HY,
I was trying to upload image using maintain ration:
like i am trying to upload image haveing ration 4:3 like this ratio how i can upload image using the codeignitor. like if image have width 800pxl than it must be height 600pxl. help me for this way so that i can use it in callback function as well in MVC


thanks